Gas measuring process and apparatus



Aug. 15, 1933. H. A. DAYNES GAS MEASURING PROCESS AND APPARATUS FiledDec. 21, 1926 INVENTOR Lb ASHL EV DAV/v55 gym" HISATTORNEY is gendissolved in'water. c a that the.;corrosive Patented Aug. '15, 1933 r IApplication December 156,215; and 1926 This inventionsrelates toimprovements in a method and means .for measuring the. amount of gasdissolved in a liquid and more particularly to the measurement of thepercentage of oxy:

It has been, established propertiesof steam-boiler feed water arelargely of thefeed water. l 1 It becomes therefore a matter ofimportance the waste device 8.

attributableto the oxygen dissolve'dctherei'n and in many casesapparatus has been added to steam-generating installations for thepurposeof removing or reducing the air or oxygen content that -meansshould be provided for measuring theoxygen content for the purpose ofchecking the Working of such" de-aerating devices and" for testing waterfromany source as to the percentage of dissolved airor oxygen. y c Thepresent invention consists in a method of determining the'quantity of'agas dissolved in a liquid, which Consists 'infselecting a second gas,scrubbing this second gas with theoriginal gas-bearing liquid, andpassing the wscrubbed gas into or through one compartment of a knowncomparing-device, Whilst an untreated portion of said second gas ispassed into or through the second compartment of the said shown, in anormal scrubbing device 5 and? finally leaves the scrubbing devicethrough awater seal 6' and thence through a pipe '7 to Pure hydrogen gasfrom an-electrolytic device 10 is generated at the electrode. 11 andpasses up through'a bell-shaped receiver 12 along a pipe 13.. The pipe13 has a T-connectionli. as shown, which'allows the pure gas to haveaccess to one chamber of a comparing device 21.

pipes 15 and 16to the lowergas space 17 of the scrubbing device5. Itthen rises, in counterflow to the water to be tested, through thescrubbing device and emerges therefrom through The flow of gas continuesthrough the 21; 1926, Serial .No.

in (treat Britain January 22, 's Claims. (01. 23-232) the pipe 118) Ajl'cp n eq on allowsi the treated as to div'idefpart ltravelingupwardalong pipe 20, socasrto reach the other cha nber of the comparing device21 and the rest of the gas tray} 'eling downward finally beingdischarged into.

theuatmosphere through the pipe 22. The delivery oi gasfrom theelectrolytic device '10 is controlled in the usual manned by a variableresistance23 acting on ai source of current. 24 and ischecked'by themeter 25,- t

V The comparing device 21 is an instrument which depends foritsoperation on the difference of heat conductivity of two different"gases,

disclosed in British Letters Patent isioiiiz mss to Shakespear.

, In operation, a continuous definite now of the waterytmbe tested ispassed through" the ,con; stant level device to the scrubbing device 5.A

measured continuous counterfiow of pure hydrogen is simultaneouslypassed through the scrubbing device and in so doing sweepsout either .a

substantially fixed proportion oi substantially the whole of thedissolved oxygensirein the water, depending-upon the design and thedimensions of the parts. The combinedgas then escapes from the upper endof the scrubbing device'to the atmosphere. One chamber of the A suitablecomparing device or-c-atharometerjis comparing device or catharometer 21is supplied with puref hydrogen and the other with the mixedgases fromthe scrubber. Suitable well-known indicating devices operated by thecatharometer 21 will then indicate or record the varying percentages oroxygen in the mixed gases, which percentage, of course, may be 3translated into percentages of oxygen originally presentcin the waterunder test. In the-event that a proportion only of the dissolved oxygenis swept out, the resulting measured value caneasily be corrected for sot'ruejvalue. Y c

The device according to the present invention may be utilized forkeeping a continuous record of the quality of boiler feed water asregards oxygen content and will serve to check the chiciency or toindicate any breakdown of the deaerating plant.

It is to be understood that thepresent invention is not confined to theparticular case of oxygen dissolved in water but applies to other gasesand other liquids which fall within its scope.

Iclaim: V 1 -A method of determining the quantity of oxygen dissolved inwater; which comprises as to yieldthe correct g;

' gas into the other compartment.

scrubbing the oxygen-containing water with hydrogen, passing a quantityof the scrubbed gas into one compartment of a gas-comparing device and aquantity of the original hydrogen into a second compartment of thegas-comparing device, and comparing the .-thermal conductivity of thegases in the compartments.

2. Apparatus for determining the quantity of a gas dissolved in a liquidtowards which it is chemically inactive, comprising a scrubbing device,a gas-comparing device having two cornpartments, means -for passing thegas-containing liquid through the scrubbing device, means for passing asecond gas that is chemically inactive towards the liquid through the"scrubbing device and into one-of the compartments,,and means forpassing a quantity of the original second 3. Apparatus for determiningthe quantity of gas dissolved in a liquid towards which it ischemicallyinactive, comprising a scrubbing device, a generator of asecond gas that is chemically inactive towards the liquid,- means forpassingythe gas-containing liquid through the scrubbing device, meansfor passing the second 'gas from the generator through the scrubbingdevice to scrub-the first-named gas, means for controlling the flow ofthe gas-containing liquid through the scrubbingdevice, means forcontrolling the generation of the second gas in the generator, and meansfor determining the com position of the scrubbed gas.

v 4. Apparatus for determining the quantity of tity of the originalsecond gas into the gas analyzer.

5. Apparatus for determining the quantity of gas dissolved in a liquidtowards which it is chemically inactive, comprising a scrubbing defvice, a generator of a second gas-that is chemically inactive towards theliquid, means for passing the gas-containing liquid in one directionthrough the scrubbing device, a seal for the liquid leaving thescrubbing device, means for passing the second gas from the generatorthrough the'scrubbing device in an opposite direction to scrub thefirst-named gas, means for controlling -the flow of the gas-containingliquid through'rthe scrubbing device, meansfor controlling thegeneration of the second gas in the generator, and means for comparing aquantityof the scrubbed gas with a quantity of the'original second gas.I

6. A method-of determining the quantity of a gas dissolved. in a liquidtowards which. it is chemically inactive, which comprises scrubbing thegas-containing liquid with, a .second gas of different thermalconductivitythat is chemical- 1y inactive towards the liquid, andcomparing the thermal conductivity of aquantity of the scrubbed gas withthe thermalconductivity of a-quantity of the original second gas.

7; Amethod of 'treatinggases that comprises scrubbing a liquidcontaining a-first gas with a second gas of different thermalconductivity,

and comparing thethermal conductivity of a quantity of the lsc'rubbedgas with the thermal conductivity of a quantity of the original secondgas.

8. A method of determining the quantity of oxygen dissolved in Water,which comprises scrubbing the oxygen-containing Water with hydrogen, andcomparing the thermal conductivity of a quantity .of thescrubbed gaswith the thermal conductivity of a quantity of the original hydrogen.

HAROLD ASHLEY DAYNTS.

iso

